/Engine/Source/Editor/UnrealEd/Public/ReferencedAssetsUtils.h
Adds the object reference to the asset list if it supports thumbnails. Recursively searches through its references for more assets
virtual [FArchive](API\Runtime\Core\Serialization\FArchive) & operator<< ( class [UObject](API\Runtime\CoreUObject\UObject\UObject) *& Obj )